Writer and Director Adam Green created a "No CGI" rule for post-production. Only CGI was used to remove on-screen wires and camera set-ups.
If you watch the first three "Hatchet" movies in a row without opening and end credits, it would be one uninterupted storyline, revolving around a few days.
The horribly deformed Young Victor Crowley, is actually played by a beautiful young actress named Rileah Vanderbilt. When make-up effects artist John Carl Buechler needed a model to test the latex prosthetic on, Rileah was the volunteer. Because the make-up effects had already been molded to her face for the test shots, Rileah played the role in the film.
This movie was the last production to shoot in Lousiana before Hurricane Katrina hit. Parry Shen (Shawn), took part in all three Hatchet movies and Victor Crowley (2017), shot in Louisiana.
When actor Joel David Moore vomits on-screen, it is real. Director Adam Green did not want the actors spitting out fake vomit, like most movies do. Though Moore managed to throw up on his own for the first take, he was supplied with a mixture of cold clam chowder and orange juice for the second take.